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Patented July 31, 1923.

UNITED STATES PATENT OFFICE.

HERBERT FROOD, OF GHAI'EL-EN-LE-FRITH, ENGLAND, ASSIGNOR TO FE BODO LIMITED,

' OF CHAPEL-EN-LE-FRITH, ENGLAND.

MATERIAL FOR FRICTIONAL AND WEARING PURPOSES.

1T0 Drawing.

To all whom it may cmwern:

Be it known that I, HERBERT Faooo, a sub i'ect of the King of Great Britain and Ireand, and a resident of Chapel-en-le-Frith. in the county of Derby, England, have invented certain new and useful Materials for Frictional and W'earing Purposes, of which the following is a specification.

This invention relates to a process for manufacturing a fabric for friction surfaces and wearing purposes.

Usually frictional and wearing fabricsof the kind referred to are saturated with the cementitious substance by immersion therein under atmospheric or elevated pressure or in vacuo. Owing, in some cases, to the nature or character of the cementitious substance or binder and, in other cases, to some prior treatment of the fabric, it frequently happens that the cementitious substance does not readily penetrate the fabric or the fibres, and the object of this invention is to provide an improved method and means of impregnation which will overcome such disadvani ccordin to this invention, frictional and wearing fa rics of the kind referred to are coated and bonded by the cementitious substance or binder being frictioned into the fabric.

The binder may be frictioned into the fabric in any suitable wa I may employ any of the known method and means used for .frictioning rubber and waterproofing compounds into fabrics for other uses. Conveniently, I may pass the fabric one or more times between rollers rotating at. different speeds and apply the binder to that surface between which and, the corresponding roller relative movement or slip takes place. The rollers may exert any desired pressure on the fabric to force the binder thereinto and consolidate same, and the frictioning may be effected under applied heat (in which case the rollers may conveniently be hollow and be heated internally by steam or otherwise suitably) or under the heat due to frictioning only. After applying the hinder, the fabric is suitably treated to finish oil and harden the binder according to the nature thereof.

Application filed March 21, 1923. Serial No. 628,641.

I may employ an suitable binder. For example, I may emp oy an enamel or the like of the kind described in specification of British Patent No. 4627 of 1909, or a binder of the kind described in specification of British Patent No. 164772, or one of the known henol-aldehyde condensation products. lternatively, I may employ as a binder a mixture of dammar gum 20%), rubber (10%), linseed or tung oil E2070), and suitable solvents, such as mineral naphtha, benzol and the like (50%) with or without animal glue or casein. Or I may employ a mixture of glue or casein and rubber, or I may use chloro-naphthalene substitution products or sodium or potassium or other silicates or mixtures thereof.

When the finished fabric is to be coloured, I may dye the fabric in the piece before impregnation, or the yarn before weaving, or the fibres in the mass, and employ a transparent hinder or similarly colour or dye the binder. Alternatively, the colouring of the finished fabric may be effected solely by the employment of a suitably coloured or dyed binder.

In some cases, the finished fabric may be provided with a metallic or other suitable ase or foundation to which it ma be secured by riveting, cementing, stitc ing or otherwise appropriately. When com osed of unwoven fibres or fibrous materia, the fabric may have incorporated in it wires, wire netting or gauze, expanded metal or other suitable reinforcement, and when composed of woven fibres I may provide the yarn with wire or other reinforcing centres or cores.

What I claim as my invention and desire to secure by Letters Patent is The process of manufacturing a friction fabric which consists in forcing a composition consisting of substantially two parts of dammar gum, substantially one part of rubber, substantially two parts of a drying oil, and substantially five parts of a solvent into a fabric by frictioning the composition into said fabric.

In witness whereof I have hereunto set In hand.

y HERBERT raoon. 

